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I purchased a dedicate server (Ubuntu 14.04 LTS amd64) with a failover ip from online.net. And i want to setup a windows vm with failover ip using kvm. I tried myself several times, but all failed. Any one could tell me how to do this? Because of my poor english and low linux knowledge, please describe steps as much detail as possible.

auto lo
iface lo inet loopback
auto em1
iface em1 inet dhcp

iface em1 inet6 static
address 2001:0bc8:xxxx::1
netmask 48
accept_ra 1
pre-up dhclient -cf /etc/dhcp/dhclient6.conf -pf /run/dhclient6.em1.pid -6 -P > em1
pre-down dhclient -x -pf /run/dhclient6.em1.pid

auto em1:0
iface em1:0 inet static
address 212.129.62.xxx
netmask 255.255.255.255

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